Underlayment under a Steel Roof

I have contracted to have a steel roof installed. It will be installed over the existing asphalt shingles. Would like to know if it is neccessary to put down a layer of underlayment first and what is the purpose of it? There will also be double batten put down as well.
Thanks

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A tear off with new underlayment and new roof would be preferred in my opinion. If you have a frame going down over the top, the use of underlayment would depend upon the ability of the existing shingles to serve the function.

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If you install battens make sure the roof panel is okay for going over battens. I would use underlayment regardless but definitely if you do not use battens. Preventing rubbing between the rough asphalt and the back of the metal is one reason.

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